METHOD FOR THE PRODUCTION OF POLYOXYMETHYLENE HOMOPOLYMERS OR COPOLYMERS BY HOMOPOLYMERIZING OR COPOLYMERIZING TRIOXANE, STARTING FROM METHANOL

摘要

To afford the containing stream (2), the aqueous formaldehyde-methanol (1) a first manufacturing system (A) a first aqueous formaldehyde is oxidized in a reactor containing stream (2) of pure trioxane (6) the to be supplied to the second production machine (B) to be obtained, there is a method for producing a polyoxymethylene homopolymer or a copolymer (7) by a single polymerization or copolymerization of trioxane in methanol, starting from (1) is disclosed. In the method, a low boiling fraction (5) is separated by distillation, pure trioxane (6) is first supplied to the third production system (C), the third production system (C) of pure trioxane (6) in a is a single polymerization or copolymerization is obtained a polyoxymethylene homopolymer or a copolymer (7). The disclosed method is characterized in that the recycle to the inlet of the first reactor of the first production system (A) for separating from the low boiling fraction stream (5) of the low-boiling point fraction column (K2). ;